There arent any chips for the cobalts. There is tuning available thru a few places like Trifecta Tuning. But you wont get a ton out of it without bolt-ons first.
the only "chip" available is the jet modules. Which do somewhat work. But if you want a better tune for your car then a local tuner with HPT or Trifecta would be the best bet. There is a bit to gain when stock. But it is best to have the mods you want on the car then to go and tune it.